Electrochemical detection of pyridoxal using a sonoelectrochemical prepared highly-oxidized carbon nanosheets modified electrode

In this paper, highly-oxidized carbon nanosheets (hCNSs) was prepared with a very simple and low cost sonoelectrochemical method. Compared with the electrochemical method without ultrasonic irradiation, the hCNSs which obtained with ultrasonic irradiation exhibited different ratio of oxygen-containing groups and better electrocatalytic property. The electrochemical behaviour and the electrooxidation mechanism of pyridoxal on the hCNSs modified electrode were investigated in detail. Compare to it on the glassy carbon electrode, the peak current of pyridoxal on the hCNSs modified electrode showed 64-folds enhancement. So a sensitive differential pulse voltammetry method based on the hCNSs modified electrode was proposed for the determination of pyridoxal. Its linear range was 2 × 10−8-1 × 10-6 mol L-1 and the detection limit was 5.4 × 10-9 mol L-1. The method has been applied to the analysis of pyridoxal in the urine and plasma sample.